A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
8 by 8 pixels, and just what the title says.
Source pixilated
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
A pale olive green background with a seamless texture.
Source V. Hartikainen
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Prismatic Groovy Concentric Background No Black
Source GDJ
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A black tile-able background with paper-like texture.
Source V. Hartikainen
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin